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首页> 外文期刊>International Journal of Biological Macromolecules: Structure, Function and Interactions >Effect of degree of deacetylation of chitosan on adsorption capacity and reusability of chitosan/polyvinyl alcohol/TiO2 nano composite
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Effect of degree of deacetylation of chitosan on adsorption capacity and reusability of chitosan/polyvinyl alcohol/TiO2 nano composite

机译：壳聚糖脱乙酰化程度对壳聚糖/聚乙烯醇/ TiO2纳米复合材料吸附能力及可重复用途的影响

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The chitosan/polyvinyl alcohol/TiO2 composite was synthesized. Two different degrees of deacetylation of chitosan were prepared by hydrolysis to compare the effectiveness of them. The composite was analyzed via field emission scanning electron microscopy, Fourier transform infrared, X-ray diffraction, thermal gravimetric analysis, weight loss test and adsorption study. The FTIR and XRD results proved the interaction among chitosan, PVA and TiO2 without any chemical reaction. It was found that, chitosan with higher degree of deacetylation has better stability. Furthermore, it also showed that higher DD of chitosan required less time to reach equilibrium for methyl orange. The adsorption followed the pseudo second-order kinetic model. The Langmuir and Freundlich isotherm models were fitted well for isotherm study. Adsorption capacity was higher for the composite containing chitosan with higher DD. The dye removal rate was independent of the dye's initial concentration. The adsorption capacity was increased with temperature and it was found from reusability test that the composite containing chitosan with higher DD is more reusable. It was notable that adsorption capacity was even after 15 runs. Therefore, chitosan/PVA/TiO2 composite can be a very useful material for dye removal. (C) 2017 Elsevier B.V. All rights reserved.
机译：合成壳聚糖/聚乙烯醇/ TiO2复合材料。通过水解制备两种不同程度的壳聚糖脱乙酰化，以比较它们的有效性。通过现场发射扫描电子显微镜，傅里叶变换红外，X射线衍射，热重量分析，减肥试验和吸附研究进行分析复合材料。 FTIR和XRD结果证明了壳聚糖，PVA和TiO2之间的相互作用而没有任何化学反应。发现，壳聚糖具有较高程度的脱乙酰化具有更好的稳定性。此外，它还表明，较高的壳聚糖DD需要更少的时间来达到甲基橙的平衡。吸附遵循伪二阶动力学模型。 Langmuir和Freundlich等温模型适用于等温线研究。含有较高DD的壳聚糖的复合材料的吸附能力较高。染料去除率与染料的初始浓度无关。温度增加了吸附能力，并从可重复使用性试验中发现，含有较高DD的壳聚糖的复合材料更可重复使用。值得注意的是，吸附能力甚至在15次运行后。因此，壳聚糖/ PVA / TiO 2复合材料可以是用于染料的非常有用的材料。 （c）2017年Elsevier B.V.保留所有权利。

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